Weed-B-Gone

Just passed apps test. Ready to spray!!!
On pricing the Lesco salesman wanted to know what side of the bed I got up on?!?!?!....
Their pricing seems goofy...
Anyway, want to hit some customers right now TODAY.
Got Weed-B-Gone from my homeowner days....Is the stuff totally amateur or would I not be doing a service to my clients until I get up to speed w/Lesco and their products?

i USE TO USE ON MY HOME LAWN (WEED BE GONE) AND IT WORKED WELL. i DONT THINK I WOULD USE IT ON CUSTOMERS LAWNS. DEPENDS ON WHAT TYPE OF WEEDS ARE EXSISTING. MY HOME LAWN WAS PRETTY MUCH WEED FREE SO I JUST USED IT FOR PREVENTIVE MAINTENANCE.